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The posterior superior iliac spine is a bony landmark on the ilium, one of the three bones that make up the hip bone. It is the posterior termination of the iliac crest, the superior border of the ilium. The posterior superior iliac spine is not palpable but is often indicated by a dimple above the buttock at the level of the second sacral spinous process. Therefore, it can be said to be found at the level S2. It provides an attachment for the posterior sacroiliac ligament and the sacrotuberous ligament. The thoracolumbar fascia also attaches to it. The posterior superior iliac spine lies over the sacroiliac joint, so patients with sacroiliac joint-mediated pain usually localise their pain around the posterior superior iliac spine.
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